code: def get_auto_bleu2_arithmetic(utterances):
      weights = (0.5, 0.5)
      return [
          auto_bleu(u, mean_mode="arithmetic", weights=weights)
          for u in utterances
      ]
  
file_path: fairseq/examples/textless_nlp/gslm/metrics/asr_metrics/self_auto_bleu.py
imports: import numpy
  import nltk
  from misc.bleu_utils import sentence_bleu
  import warnings
label_desc: Use image node_id 6 for calling a global function with example usage: get_auto_bleu2_arithmetic(utterances) and returns: unknown